Motor-driven cutting and breaking machine



March 4, 1952 w v CORNETT 2,587,969

MOTOR-DRIVEN CUTTING AND BREAKING MACHINE Filed May 27, 1946 2 SHEETS-SHEET 1 INVENTORQ WALTER M CORNE 771' A TTORNEKS.

March 4, 1952 w. v. CORNETT MOTOR-DRIVEN CUTTING AND BREAKING MACHINE Filed May 27, 1946 2 SHEETSSHEET 2 1! Him INVENTOR. WALTER L CORNETZ A TTORNEVS.

Patented Mar. 4, 1952 MOTOR-DRIVEN CUTTING AND BREAKING MACHINE Walter V. Cornett, Los Anzeles, Calif,

Application May 27, 1946, Serial No. 672,605

6 Claims. (01. 262-13) This invention relates to a motor driven cut ting and breaking machine which maybe used for a variety of purposes, such as breaking up old concrete roads, foundations, walls, floors. and the like, and the main object of the invention is to provide a machine of the class described having certain improvements as will be hereinafter pointed out, as compared with the machine disclosed in U. S. Patent No. 2,335,171, dated November 23, 1943, and entitled Portable Cutting and Breaking Machine.

Another object of the instant invention is to provide a motor driven cutting and breaking machine having an operating station, which may be a seat for the operator, so that the operator withoutleaving the seat may control a motor on the machine to move the same forward or backward, and by the same motor. revolve the working tool carried on the machine while operating the tool as. hereinafter described.

In the aforesaid patent is disclosed a portable cutting and breaking machine having two front and two rear wheels, which may be independently moved to steer the machine. No provision is made whereby the operator when on his station in the rear of the machine may steer the front wheels. In the machine described in the instant application, a single front wheel is employed which may be steered from the operator's station.

Inthe machine shown in the aforesaid patent the operating tool is an air hammer suspended from a boom and the boom and hammer may be moved relative to the vehicle by hand. In the instant application, provision is made to move the hammer by means of a motor mountedon and forming part of the machine, And the ma-- chine is also propelled forward and backwards by this same motor. The controls to the motor are so disposed that the operator may operate them from his station.

In the machine shown in the aforesaid patent, independent rear wheel brakes are used whereby either of the brakes may be set to hold a wheel about which the machine may turn. That is to say, the machine is rotatedby applying one brake while the other rear wheel remains free and the motor is then operated thereby driving the rear end on a radius-like line from the fixed wheel thereby causing the front of the machine to travel in a circular direction around the fixed rear wheel, and in the patented device the hammer is mounted in front of the machine and so positioned by moving the entire machineas just described.

In the instant application, a standard rear end wheel assembly with brakes is employed and the only use made of the brakes is to stop the machine, both brakes being. applied to the hind wheels in the usual way by means of a hand lever or other control positioned within easy reach of the operator when on his station.

Other objects and advantages will be apparent from the following specification and the accompanying drawings which illustrate a preferred form ofhthe device. It will be understood however, that this disclosure is merely illustrative and, that many changes in the details of construction can be made, the invention being defined by the appended claims.

In the accompanying drawings:

Figure 1. is a side view of the machine embodying the invention.

Figure 2 is a plan or top view of the machine shown in Figure 1.

Fig. 3 is a diagrammatic view of the shift lever 41 showinghow it is used to connect the output shaft of the transmission to the rear axle assembly or to connect said transmission to move the vertical boom 44 and parts carried thereby.

Referring to the figures, the numeral I ll denotes amainframe forming a chassis, which has secured to it inthe ordinary way a rear: axle assembly, which includes the springs II and I2, the rear axle. 13 containing the usual differential ears andother parts for driving the rear wheels l4, I5. It will be understood that this rear axle assembly has the usual brake drums, oneof which is shown at 16 and may have any suitable type of brake rigging.

An operator station is located on the main frame, and this may comprise a suitable seat I1 on which the operator may sit while operating the machine.v While for the sake of. illustration the operator station is shown as a seat, it will beunderstood thatthis may comprise .a platform upon. which the operator may stand, and that by station is meant throughout this specification a fixed location for the operator from which the various controls hereinafter referred to are manipulated as distinct from an arrangement where the operator would, have to move about on the main frame in order to operate said controls if they were not grouped together at the station.

In order to control the brakes on the rear Wheels, a brake lever I3 is located within easy reach of the operators station and this is connected through the usual lever system, one of the levers of which is shown at I9, with the rear wheel brakesin drums [6, the brakes being operated in the usual manner.

It is, of course, obvious that any suitable hydraulic or other brake mechanism may be substituted for the mechanical mechanism just described. However, insofar as the instant invene tion is concerned, the only requisite is that the brake control lever l8 be positioned adjacent the operators station.

The machine issteered by providing the usual steering wheel assembly, the hand wheel of which is connected through any suitable mechanism including the steering rod 2 l, with the wheel yoke 22 which is mounted in the bearing 23 secured to the forward end of the chassis. It will be observed that the steering wheel 20 is within easy reach of the operator when he is seated on seat H. The mounting and construction of the steering mechanism to steer the single front wheel 24 is immaterial so far as the instant invention is concerned, except with respect to the location of the steering wheel 20.

In order to be able to tow the machine rapidly from place to place as a trailer is towed, the yoke 22 may have aforwardly extending clevis 25 to receive a tow chain or bar 26, which when not in use may be tipped upwardly and back into the groove 21 in the top of the yoke as shown in Figure 2. A suitable motor 28 is mounted on the main frame. This may be an electric motor or a motor which is driven by gasoline or air. For the sake of illustration, it will be assumed that this. motor is an air motor of reversible type, in that such a motor can be operated from the air compressor presently referred to.

Motor 28 has a shaft which extends through a housing 29 and connects to the input shaft of a suitable transmission 36. The construction of this transmission is immaterial except that it has two output shafts designated as 3|, 32 respectively.

The air motor 28 has a control valve generally indicated by the numeral 33 which controls the air through pipes 34 which connect the valve to the motor.

The air valve 33 is of any suitable construction wherein the lever 35 when moved in one direction will admit air to the motor to cause same to revolve in a. clockwise direction, and when moved in the opposite direction to cause the motor to move in an anti-clockwise direction. When the lever 35 is in a neutral position the motor is at rest and the magnitude of the movement of the lever 35 determines the amount of air admitted to the motor and consequently regulates the speed thereof. 1

The air valve lever' 35 is connected through a suitable system of levers, one of which is indicated at 36 which system of levers finally terminates at the control handle or lever 31' adjacent to operator's seat H so that this handle may be manipulated by the operator without leaving the seat, so that the operator can thereby operate the motor at any desired speed in either direction. The air valve 33 is connected via a supply pipe 36 to a main supply pipe 39 which may be connected to any suitable source of air such as a portable air compressor. However, if desired, an air compressor with its driving motor of any suit able type and all other auxiliary equipment to make a self-contained power plant may be mounted within the hood shown in dotted lines at 40 in Figure 1 and thereby carried upon the chassis l0 and forming a part of the complete: machine.

A shift lever 4| is located adjacent the operator's station or seat l1. so as to be within easy reach of the operator, and the lower end of this lever is connected to suitable shifting mechanism indicated at 42, associated with the transmission 36. By moving the lever 4| in one direction, for example forward, away from the operator, output shaft 3| of the transmission will be engaged and power will be transmitted to the rear axle assembly [3 to revolve the rear wheels l4 and I5 and move the machine forward, and by moving the handle 31 controlling the air valve 33, motor 28 may be reversed thereby causing the entire machine to move backwards.

By moving the shift lever 4| to the rear or to- Wards the operator, output shaft 32 of the transmission will be energized thereby revolving the worm 43 moving the vertical boom 44 and parts carried thereby. The vertical boom 44 is pivotal- 1y secured at its lower end to the angle plates 45, 46 secured to circular plate 41, supported to a stub shaft (not shown) supported in a fixed plate 48'attached to the main frame ill. The lower end of the stub shaft which is secured to plate 41 carries a worm gear 49 which is meshed with the worm 43 so that when the said worm is revolved gear 49 is rotated carrying with it boom 44 and all of the parts associated therewith.

The boom 44 has secured thereto outwardly extending horizontal arms 56, 5| between which may bemounted in any suitable manner a working tool of any type, which for the sake of illustration is shown as an air hammer, similar to that shown in U. S. Patent Nos. 1,830,751 or 1,830,752, dated NovemberlO, 1931, which also shows an air control valve. for reciprocating the hammer head as presently described. It is sufficient for the purposes of the present application to state that the said tool 52 comprises a cylinder in which there is a reciprocating piston connected via a piston rod 52a to a suitable cutting or breaking tool such as the hammer head 53. By alternately admitting air via the flexible pipes 54 and 55 respectively, the piston reciprocates causing the hammer head 53 to strike the pavement 56 to be demolished, or to do any other desired work. The entire boom assembly is pivoted at 51 so that by removing the stay rods 58, 59, 60, extending'between the top of the boom and the frame It], the entire boom assembly can be folded about the boom pivot 51 from a position shown in full to the position shown in dotted lines in Figure 1. When in the latter position the boom assembly may rest within the fixture 6| which is adapted to receive and firmly hold the boom 59 in the position shown in'dotted lines,

Figure 1.

The flexible pipe connections 54, 55 are led in any suitable manner to the hammer control valve, generally indicated by the numeral 62 which maybe of any suitable type, having a han-. dle 63, easily accessible by the operator at the seat or station II. By moving this handle in the manner described for the similar control handle in the aforesaid patents granted November 10, 1931 the hammer head is caused to reciprocate. The valve 62 is connected to the main air supply pipe 39 in any suitable manner as by the pipe 64, and the exhaust from the valve 62 and the hammer 52 may be carried upward by pipe 65 and discharged into the air at a point above the operators head. To facilitate the raising and lowering of the boom carrying the hammer, the upright 66 is secured to the main frame and has a horizontal extension 61 at the top extending out over the boom and carrying any suitable form of. hoistasindicated at 68, which hoistby means asa'nece of a cable or chain 69 may be used to raise and lower. the boom. By this means the hoist is always at hand when needed and forms an operating part of the machine.

It will be observed from the foregoing description that the machine is comprised largely of standard parts which are assembled in a special way to produce a new and useful result and that in operation the machine with the boom located in the position shown in dotted lines, Figure 1, may be rapidly transported from place to place as a tow, the tow-bar 26 being used for this purpose.

Having reached the desired location the operator takes his seat at seat I! and the air supply pipe 39 being connected to a suitable source of compressed air, the operator by manipulating shift lever 41 may move the boom by power supplied by motor 28 as previously described, and the boom can be moved to carry the tool 52 through the are shown in dot-dash lines in Figure 2, the hammer being reciprocated the while by operating valve 52 as previously described.

All of the pavement 55 having been broken in the arc traversed by the hammer, the operator may now without leaving seat l1 operate the shift lever 4| to disconnect motor 28 from the boom and connect it to the rear drive, thereby moving the entire machine forward so that a different part of the pavement as can be broken.

By manipulating air valve lever 31 the direction of the motor can be reversed thereby when the motor is engaged with the boom, reversing the direction of movement of the boom, or if the motor is connected to the rear axle, reverse the direction of the movements of the complete machine.

It will also be observed that the air hammer 52 may be operated in a horizontal position as shown in Figure l in dotted lines, and can therefore be used to demolish walls and other light structures which can be reached by operating the hammer head 53 in a horizontal plane. The chain 69a shown in Figure 1 is merely for the purpose of holding the hammer head 53 out of contact with the pavement when the hammer 52 is in the vertical position and not in use and may be hooked into the eye If! when the chain is not in use.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is as follows:

1. In a cutting and breaking machine, a main frame forming a chassis, wheels supporting said frame, a motor on said frame, an operator's station on said frame; manually operable means within reach of an operator at said station for controlling the operation of said motor, a transmission adapted to be driven by said motor; manually operable means including a lever within reach of an operator at said station for connecting and disconnecting said transmission to some of said wheels to rotate the same, a tool, a support for said tool rotatably mounted on said frame, and means operable by said lever for connecting and disconnecting said transmission to said support to rotate same, wherein said lever is movable in one direction to control the wheels and in another direction to control the tool support.

2. In a cutting and breaking machine, a main frame forming a chassis, an operators seat on the side of said chassis, a rear axle assembly below said chassis having the usual road wheels and brake assembly and including a brake lever, a motor, a first control means for controlling the speed and direction of rotation of said motor, asecond control means including a lever for connecting said motor to said rear axle assembly to rotate the road wheels thereof; a pneumatic reciprocating impact tool and means for moving the same supported on said frame, means operable. by said lever for moving said tool and a third control means including a valve for controlling the operationof said tool, all three of said control means being positioned adjacent said operator's seat for operation by an operator seated thereon.

3. In a. cutting and breaking machine, a main frame forming a chassis, an operators seat on the side of said chassis, a rear axle assembly below said chassis having the usual road wheels and brake assembly and including a brake lever, a motor, a first control means for controlling the speed and direction of rotation of said motor, a second control means including a lever for connecting said motor to said rear axle assembly to rotate the road wheels thereof; a pneumatic reciprocating impact tool and means for moving the same supported on said frame, means operable by said lever for moving said tool and a third control means including a valve for controlling the operation of said tool, all three of said control means being positioned adjacent said operators seat for operation by an operator seated thereon, including a steering wheel adjacent said seat and connected to a front road wheel of the machine.

4. In a cutting machine, a main frame forming a chassis, a frontwheel pivotally supported on said chassis, steering means connected to said wheel and extending to and terminating in a steering wheel, an operator's station on said chassis adjacent said steering wheel, rear wheels support ing the rear end of said chassis, a motor on said chassis, fuel supply means for said motor carried on said chassis, a transmission connected to said motor, a lever adjacent said station to be operated by an operator thereat to connect said transmission to said rear wheels to move said machine, a pneumatic reciprocating impact tool, a support for said tool rotatably mounted on said chassis, said tool depending therefrom, means operable by said lever for connecting said transmission to said tool support to rotate same, and valve means adjacent said operators station for controlling the reciprocation of said tool.

5. In a cutting machine, a main frame forming a chassis, a front wheel pivotally supported on said chassis, steering means connected to said wheel and extending to and terminating in a steering wheel, an operators station on said chassis adjacent said steering wheel, rear wheels supporting the rear end of said chassis, a motor on said chassis, fuel supply means for said motor carried on said chassis, control means on said chassis for operating said motor, a transmission connected to said motor, a lever adjacent said station to be operated by an operator thereat to connect said transmission to said rear wheels to move said machine, a pneumatic reciprocating impact tool, a support for said tool rotatably mounted on said chassis said tool depending therefrom, means operable by said lever for connecting said transmission to said tool support to rotate same, and valve means adjacent said operators station for controlling the reciprocation of said tool.

6. In a cutting and breaking machine, a main frame forming a chassis, a front wheel pivotally supported on said chassis, steering means connected to said wheel and extending to and terminating in a steering wheel, an operator's station on said chassis adjacent said steering wheel, rear wheels supporting the rear end of said chassis, a reversible motor on said chassis, fuel supply means for said motor carried on said chassis, control means on said chassis for operating said motor in either direction, a transmission connected to said motor, a lever adjacent said station to be operated by an operator thereat to connect said transmission to said rear wheels to move said machine, a pneumatic reciprocating impact tool, a support for said tool rotatably mounted on said chassis, said tool depending therefrom, means operable by said lever for connecting said transmission to said tool support to rotate same,

and valve means adjacent said operators station for controlling the reciprocation of said tool.

WALTER V. CORNETT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,684,882 Penote Sept. 18, 1928 2,335,172 Cornett Nov. 23, 1943 

